Analysis and modification of cuts in Brunel and DaVinci about B→J/ѱ Ks

Application Brunel in LHCb for reconstruction, and DaVinci for Analysis. Compared with DaVinci, Brunel contains more information, and is much more efficient. While the cuts in Brunel and DaVinci are very different and people use DaVinci now. It’s a good idea to find the differences between the two and make Brunel the same as DaVinci after applying the cuts through some modification. In this report, the process finding where the differences lie and modifying Brunel to make it the same as DaVinci are demonstrated. At the same time, results and further work are presented.